diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index ebd2e8f66..dc47b382d 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -660,11 +660,11 @@ std::string Print::validate(std::string* warning) const
         if (m_config.use_relative_e_distances) {
             // See GH issues #6336 #5073
             if (! before_layer_gcode_resets_extruder && ! layer_gcode_resets_extruder)
-                return "Relative extruder addressing requires resetting the extruder position at each layer to prevent loss of floating point accuracy. Add \"G92 E0\" to layer_gcode.";
+                return L("Relative extruder addressing requires resetting the extruder position at each layer to prevent loss of floating point accuracy. Add \"G92 E0\" to layer_gcode.");
         } else if (before_layer_gcode_resets_extruder)
-            return "\"G92 E0\" was found in before_layer_gcode, which is incompatible with absolute extruder addressing.";
+            return L("\"G92 E0\" was found in before_layer_gcode, which is incompatible with absolute extruder addressing.");
         else if (layer_gcode_resets_extruder)
-                return "\"G92 E0\" was found in layer_gcode, which is incompatible with absolute extruder addressing.";
+                return L("\"G92 E0\" was found in layer_gcode, which is incompatible with absolute extruder addressing.");
     }
 
     return std::string();